Year round parks regularly close down rides for maintenance through the year. Last 4 times I’ve been to UO (September, March, January, November) Dudley Do-Right has been down. And on those trips at various times Hogwarts has been down, Hulk has been down, Dr Doom, MiB, Mummy, HRRR.
To me the big difference between the was BGW and the way UO/WDW handle rides down for maintenance is that UO/WDW are busy enough that other rides “pick up” the slack AND they manage to always toss something new in with their maintenance. Whether that be paint touch ups, ride upgrades, or just reworking the queue. Makes you think they were closed to upgrade over just maintain.
I think BGWs biggest battle isn’t the when or when not to close rides in near year round operation. It’s how do you manage your maintenance so that it starts to look like the rides are down for something other than maintenance.